Sets

- A
**set**is a well-defined collection of objects. - Sets are usually represented by capital letters
*A*,*B*,*C*,*D*,*X*,*Y*,*Z*, etc. The objects inside a set are called**elements**or**members**of a set. They are denoted by small letters*a*,*b*,*c*,*d*,*x*,*y*,*z*, etc. - If
*a*is an element of a set*A*, then we say that “*a*belongs to*A*” and mathematically we write it as “*a*∈*A*”; if*b*is not an elem…

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